On 10/03/15 15:53, Marco Leise via Digitalmars-d wrote: > Am Mon, 28 Sep 2015 21:40:43 +0000 > schrieb Freddy <hexagonalsta...@gmail.com>: > >> Are any D idioms you use that you like to share? >> Heres one of mine >> --- >> enum ctfe = >> { >> return 0xdead & 0xbad; >> }(); >> --- > > Yep, using that often, although I try to get my head around > using functional style one-line expressions where possible to > avoid the boilerplate. > > static immutable ctfe = { > bool[256] result; > foreach (i; 0 .. 256) > result = isDigit(i); > return result; > }(); > > ==> > > static immutable bool[256] ctfe = iota(256).map!isDigit.array; > > ==> > > static ctfe = ctfeArr!( iota(256).map!isDigit ); > > enum ctfeArr(alias r)() > { > // r.length doesn't work as static array size > enum length = r.length; > // immutable doesn't work on this (cannot modify const) > ElementType!(typeof(r))[length] result = r.array; > // Cross fingers here ... > return cast(immutable) result; > }
==> static ctfe = ctfeArr!( iota(256).map!isDigit() ); immutable typeof(R.front)[R.array().length] ctfeArr(alias R) = R.array(); [`array` is only required because of compiler issues, yes.] artur